关键词: 芳烃联合装置, 歧化单元, 歧化催化剂, 器内再生, 器外再生, 结焦失活, 总转化率, 总选择性

Abstract:

The disproportionation unit is an important component of aromatics complex. Comparing the calibration results of the ex-situ regenerated disproportionation catalyst with the technical agreement values of the new catalyst, it is found that the performance of the ex-situ regenerated catalyst can basically reach the level of the new catalyst. The operational data of the first four months after the operation of the in-situ and ex-situ regenerated catalysts are compared. At similar weight hourly space velocity, the total conversion rate of the ex-situ regenerated catalyst is slightly lower than that of the in-situ regenerated catalyst, while the total selectivity is slightly higher and the hydrogen consumption is slightly lower. As the operating time prolongs, the in-situ regenerated catalyst maintains operation at a high weight hourly space velocity, and the reaction temperature slightly increases; when the operating load of the in-situ regenerated catalyst is 105.4%, the total conversion rate decreases by 2.2 percentage points, and the total selectivity slightly decreases by 0.5 percentage points; the weight hourly space velocity and reaction temperature of the ex-situ regenerated catalyst are relatively low, which may be related to the slightly lower processing capacity of the selected unit; when the operating load of the ex-situ regenerated catalyst is 92.3%, the total conversion rate decreases by 2.45 percentage points, the total selectivity increases by 1.21 percentage points, and the chemical hydrogen consumption decreases by 0.1 percentage points. In addition, if conditions permit, the total conversion rate of the reaction should be controlled between 42% and 44% to balance catalyst deactivation rate, selectivity and energy consumption.

Key words: aromatics complex, disproportionation unit, disproportionation catalyst, in-situ regeneration, ex-situ regeneration, coking deactivation, total conversion rate, overall selectivity